In the Gorge of King Xorbb: "Big nasty" - has some pretty heavy nukes and charms. Just like the other evil eyes in the maze, only tougher. Lord Soptyvr spawns on the altar in the middle of the other evil eye spawns. Note that minotaurs are KOS to him. (Information from: Greldon Silverhand, Cleric of Tarew Marr Server)
In the Valley of King Xorbb: Lord Soptyvr is encountered in the anniversary group mission "Evil Eye Operative" (see this quest entry for information).